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<title>wi arithmetic on poly_ints (GNU Compiler Collection (GCC) Internals)</title>

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Next: <a href="Division-of-poly_005fints.html" accesskey="n" rel="next">Division of <code class="code">poly_int</code>s</a>, Previous: <a href="Using-poly_005fint-with-C_002b_002b-arithmetic-operators.html" accesskey="p" rel="prev">Using <code class="code">poly_int</code> with C++ arithmetic operators</a>, Up: <a href="Arithmetic-on-poly_005fints.html" accesskey="u" rel="up">Arithmetic on <code class="code">poly_int</code>s</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsection" id="wi-arithmetic-on-poly_005fints-1"><span>10.4.2 <code class="code">wi</code> arithmetic on <code class="code">poly_int</code>s<a class="copiable-link" href="#wi-arithmetic-on-poly_005fints-1"> &para;</a></span></h4>

<p>As well as the C++ operators, <code class="code">poly_int</code> supports the following
<code class="code">wi</code> routines:
</p>
<div class="example smallexample">
<pre class="example-preformatted">wi::neg (<var class="var">p1</var>, &amp;<var class="var">overflow</var>)

wi::add (<var class="var">p1</var>, <var class="var">p2</var>)
wi::add (<var class="var">p1</var>, <var class="var">c2</var>)
wi::add (<var class="var">c1</var>, <var class="var">p1</var>)
wi::add (<var class="var">p1</var>, <var class="var">p2</var>, <var class="var">sign</var>, &amp;<var class="var">overflow</var>)

wi::sub (<var class="var">p1</var>, <var class="var">p2</var>)
wi::sub (<var class="var">p1</var>, <var class="var">c2</var>)
wi::sub (<var class="var">c1</var>, <var class="var">p1</var>)
wi::sub (<var class="var">p1</var>, <var class="var">p2</var>, <var class="var">sign</var>, &amp;<var class="var">overflow</var>)

wi::mul (<var class="var">p1</var>, <var class="var">c2</var>)
wi::mul (<var class="var">c1</var>, <var class="var">p1</var>)
wi::mul (<var class="var">p1</var>, <var class="var">c2</var>, <var class="var">sign</var>, &amp;<var class="var">overflow</var>)

wi::lshift (<var class="var">p1</var>, <var class="var">c2</var>)
</pre></div>

<p>These routines just check whether overflow occurs on any individual
coefficient; it is not possible to know at compile time whether the
final runtime value would overflow.
</p>
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